CN211825683U - Optical fiber heavy metal ion sensor based on Fabry-Perot interference - Google Patents
Optical fiber heavy metal ion sensor based on Fabry-Perot interference Download PDFInfo
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- CN211825683U CN211825683U CN202020328307.5U CN202020328307U CN211825683U CN 211825683 U CN211825683 U CN 211825683U CN 202020328307 U CN202020328307 U CN 202020328307U CN 211825683 U CN211825683 U CN 211825683U
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- borosilicate glass
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- quartz glass
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Abstract
The utility model discloses an optical fiber heavy metal ion sensor based on Fabry-Perot interference, which comprises a single mode optical fiber, a quartz glass capillary tube, high borosilicate glass and an active layer; the single-mode optical fiber is inserted into the through hole of the quartz glass capillary, and one side end face of the quartz glass capillary is fixedly connected with one side end face of the high borosilicate glass; the other side end face of the high borosilicate glass is fixedly connected with one side end face of the active layer. By utilizing the advantages of optical fiber interference and the slight change of the refractive index and the thickness of the modified high molecular compound after the modified high molecular compound absorbs the heavy metal ions, the change of interference fringes is caused, the concentration of the heavy metal ions in the environment can be rapidly, conveniently and highly sensitively measured according to a high-resolution demodulation algorithm, and the heavy metal pollution condition in the environment or food can be effectively evaluated. Meanwhile, the interference fringe variation quantity of the active layer caused by the change of the environmental temperature can be eliminated through the interference fringe variation information caused by the thickness change of the high borosilicate, so that the measurement precision of the heavy metal ions is improved.
Description
Technical Field
The utility model relates to a heavy metal ion detection area especially relates to an optic fibre heavy metal ion sensor based on fabry-perot interferes.
Background
With the rapid development of national economy and society, various industrial wastewater discharge, sewage irrigation, unreasonable and practical chemical fertilizers, air pollution and the like are continuously generated, and the phenomenon that the environment, water resources and soil are polluted by heavy metals is increasingly serious. The heavy metal ions are difficult to degrade and are easy to be absorbed by human bodies continuously through drinking water or food chains, and the heavy metal ions are deposited and enriched in the human bodies, are toxic to the human bodies after exceeding a certain concentration, cause direct harm to the human bodies and endanger the health of the human bodies. After being absorbed by human body, heavy metal elements can cause protein denaturation, enzyme inactivation and structural and functional damage to histiocytes, so that the detection of the content of heavy metal is very important for the healthy life of people, and the research on a high-sensitivity detection method for heavy metal ion selectivity is of great significance.
The traditional detection method for heavy metal content mainly comprises atomic absorption spectrometry, atomic emission spectrometry, atomic fluorescence spectrometry, mass spectrometry, enzyme inhibition method and electrochemical analysis detection method. The analysis and test methods of the instruments have respective advantages, but have the defects of complex detection, long time consumption, complex operation and the like, and always troubles the detection of the heavy metal ions at present. There is an urgent need for a sensor that can detect the content of heavy metal ions conveniently, quickly and with high sensitivity.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an optic fibre heavy metal ion sensor based on fabry-perot is interfered to solve the problem that above-mentioned prior art exists, can survey the heavy metal ion content in the environment high-efficiently.
In order to achieve the above object, the utility model provides a following scheme: the utility model provides an optical fiber heavy metal ion sensor based on Fabry-Perot interference, which comprises a single mode optical fiber, a quartz glass capillary tube, high borosilicate glass and an active layer;
the single-mode optical fiber is inserted into the quartz glass capillary, and one end of the single-mode optical fiber extends out of one end of the quartz glass capillary; the other end of the quartz glass capillary tube is fixedly connected with one end of the high borosilicate glass;
the other end of the high borosilicate glass is fixedly connected with one end of the active layer.
Preferably, the inner diameter of the quartz glass capillary is 126-128 microns, and the outer diameter is 1-2.5 mm; the thickness of the high borosilicate glass is 100-500 microns.
Preferably, the end face of the quartz glass capillary tube contacting the high borosilicate glass and the end face of the single mode optical fiber contacting the high borosilicate glass should have a finish of grade 12 or more.
Preferably, the single-mode optical fiber and the quartz glass capillary are fixedly connected through epoxy glue.
The utility model discloses a following technological effect: the utility model discloses utilize to lead to the slight change of its refracting index and thickness behind the advantage that optic fibre interfered and the modified macromolecular compound absorption heavy metal ion to arouse the change of interference fringe, according to high resolution demodulation algorithm, can make things convenient for the heavy metal ion concentration in the high sensitivity ground measurement environment fast, thereby can effectively assess the heavy metal pollution condition in environment or the food. Meanwhile, the thickness change of the high borosilicate glass can be caused when the environmental temperature changes, and the thickness change of the active layer can be caused at the same time, so that the interference fringe variation quantity of the active layer caused by the environmental temperature change can be eliminated through the interference fringe variation information caused by the thickness change of the high borosilicate glass, and the measurement precision of heavy metal ions is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a structural diagram of an optical fiber heavy metal ion sensor based on Fabry-Perot interference according to the present invention;
fig. 2 is a schematic diagram of optical signal transmission of the optical fiber heavy metal ion sensor based on fabry-perot interference according to the present invention;
FIG. 3 is a schematic diagram of a system for detecting heavy metal ions by using the fiber heavy metal ion sensor based on Fabry-Perot interference of the present invention;
the optical fiber comprises a single-mode optical fiber 1, a quartz glass capillary 2, a borosilicate glass 3, an active layer 4, a first reflecting surface 5, a second reflecting surface 6, an exposed side end surface of the active layer 7, an optical signal reflected by the end surface of the quartz glass capillary and the interface of the borosilicate glass 8, an optical signal reflected by the interface of the borosilicate glass and the active layer 9, an optical signal reflected by the surface of the active layer 10, a light source 11, an optical fiber coupler 12, a container for storing heavy metal ion solution 13, a heavy metal ion sensor 14 and a signal demodulation and output display device 15.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
As shown in FIG. 1, the utility model provides an optic fibre heavy metal ion sensor based on fabry-perot interferes, including single mode fiber 1, quartz glass capillary 2, borosilicate glass 3, active layer 4. Structurally, the peripheral surface of the single-mode optical fiber 1 is coated with epoxy glue OE188 and then inserted into the through hole of the quartz glass capillary tube 2, and the end faces of one side of the single-mode optical fiber and one side of the single-mode optical fiber are flush, and the end face of one side of the quartz glass capillary tube 2 is fixedly connected with the end face of one side of the high borosilicate glass 3; the other side end face of the high borosilicate glass 3 is fixedly connected with one side end face of the active layer 4.
Further optimizing the scheme, the inner diameter of the quartz glass capillary tube 2 is 126-128 microns, and the outer diameter is 1-2.5 mm; the thickness of the high borosilicate glass 3 is 100-500 microns, and the end face of the quartz glass capillary 2, which is in contact with the high borosilicate glass 3, and the end face of the single-mode optical fiber 1, which is in contact with the high borosilicate glass 3, have the finish degree of 12 or above. The single-mode optical fiber and the quartz glass capillary are fixedly connected through epoxy glue OE 188.
The measurement principle of the optical fiber heavy metal ion sensor based on Fabry-Perot interference according to the invention is described below with reference to the accompanying drawings 2-3.
As shown in fig. 2, the silica glass capillary 2 and the high borosilicate glass 3 are physically formed into a first reflecting surface having an end surface 5 as a reflecting surface where the silica glass capillary 2 and the high borosilicate glass 3 are in contact with each other, due to the difference in refractive index; the refractive indexes of the high borosilicate glass 3 and the active layer 4 are different, and a second reflecting surface 6 is formed; the first reflecting surface 5 and the second reflecting surface 6 form two reflecting surfaces of a first fabry-perot cavity, and the second reflecting surface 6 and the surface 7 of the active layer 4 form two reflecting surfaces of a second fabry-perot cavity. The optical signal of the optical fiber is transmitted from left to right, when the optical signal is transmitted to the second reflecting surface 6, partial reflection 8 is generated, namely the optical signal reflected by the end surface of the quartz glass capillary 2 and the interface of the borosilicate glass 3, the residual optical signal is transmitted to the right continuously in the borosilicate glass 3, when the optical signal is transmitted to the interface 6, namely the second reflecting surface, partial reflection 9 is generated, namely the optical signal reflected by the interface of the borosilicate glass 3 and the active layer 4, then the residual optical signal is transmitted to the right continuously in the active layer 4, finally reflection is generated on the outer surface 7 of the active layer 4, the optical signal 8 reflected by the end surface of the quartz glass capillary 2 and the interface of the borosilicate glass 3 and the optical signal 9 reflected by the interface of the borosilicate glass and the active layer interfere, and the optical signal 9 reflected by the interface of the borosilicate glass 3 and the active layer 4 and the optical signal 10 reflected by the surface of the active, the optical signal 8 reflected by the end face of the quartz glass capillary 2 and the interface of the borosilicate glass 3 and the optical signal 10 reflected by the surface of the active layer also interfere (this interference signal is negligible when the sensor signal is extracted). After the active layer 4 adsorbs the heavy metal ions, the refractive index or the thickness of the active layer is changed, and interference signals generated by an optical signal 9 reflected by the interface between the high borosilicate glass 3 and the active layer 4 and an optical signal 10 reflected by the surface of the active layer are changed to reflect the change of the content of the heavy metal ions; when the ambient temperature changes, the thickness of the borosilicate glass 3 also changes, interference signals generated by an optical signal 8 reflected by the end face of the quartz glass capillary and the interface of the borosilicate glass and an optical signal 9 reflected by the interface of the borosilicate glass and the active layer will change, interference signals generated by the optical signal 9 reflected by the interface of the borosilicate glass 3 and the active layer 4 and an optical signal 10 reflected by the surface of the active layer will also change, and therefore, the total change generated by the optical signal 9 reflected by the interface of the borosilicate glass 3 and the active layer 4 and the optical signal 10 reflected by the surface of the active layer can eliminate errors caused by temperature when the concentration of heavy metal ions is detected according to the change of the interference signals 8 and 9 reflected by the interface.
As shown in fig. 3, the heavy metal ion sensor 14 is disposed in a container 13 for storing a heavy metal ion solution, an optical signal emitted by the light source 11 reaches the heavy metal ion sensor 14 through the optical fiber coupler 12 and the optical fiber, and a reflected interference signal generated by the heavy metal ion sensor 14 by acquiring the content of the heavy metal ion is transmitted to the signal demodulation and output display device 15 through the optical fiber coupler 12 and the optical fiber for demodulation and output display.
The utility model discloses utilize to lead to the slight change of its refracting index and thickness behind the advantage that optic fibre interfered and the modified macromolecular compound absorption heavy metal ion to arouse the change of interference fringe, according to high resolution demodulation algorithm, can make things convenient for the heavy metal ion concentration in the high sensitivity ground measurement environment fast, thereby can effectively assess the heavy metal pollution condition in environment or the food. Meanwhile, the thickness change of the high borosilicate glass can be caused when the environmental temperature changes, and the thickness change of the active layer can be caused at the same time, so that the interference fringe variation quantity of the active layer caused by the environmental temperature change can be eliminated through the interference fringe variation information caused by the thickness change of the high borosilicate glass, and the measurement precision of heavy metal ions is improved.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements to the technical solution of the present invention without departing from the spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.
Claims (4)
1. An optical fiber heavy metal ion sensor based on Fabry-Perot interference is characterized by comprising a single-mode optical fiber, a quartz glass capillary tube, high borosilicate glass and an active layer;
the single-mode optical fiber is inserted into the quartz glass capillary, and one end of the single-mode optical fiber extends out of one end of the quartz glass capillary; the other end of the quartz glass capillary tube is fixedly connected with one end of the high borosilicate glass;
the other end of the high borosilicate glass is fixedly connected with one end of the active layer.
2. The Fabry-Perot interference-based optical fiber heavy metal ion sensor according to claim 1, wherein the quartz glass capillary has an inner diameter of 126-128 μm and an outer diameter of 1-2.5 mm; the thickness of the high borosilicate glass is 100-500 microns.
3. The fabry-perot interference based optical fiber heavy metal ion sensor according to claim 1, wherein the end face of the quartz glass capillary contacting the borosilicate glass, and the end face of the single mode optical fiber contacting the borosilicate glass, have a finish of 12 or more.
4. The fabry-perot interference based fiber optic heavy metal ion sensor of claim 1, wherein: the single-mode optical fiber and the quartz glass capillary are fixedly connected through epoxy glue.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020328307.5U CN211825683U (en) | 2020-03-17 | 2020-03-17 | Optical fiber heavy metal ion sensor based on Fabry-Perot interference |
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| CN202020328307.5U CN211825683U (en) | 2020-03-17 | 2020-03-17 | Optical fiber heavy metal ion sensor based on Fabry-Perot interference |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111208088A (en) * | 2020-03-17 | 2020-05-29 | 广东海洋大学 | Optical fiber heavy ion sensor based on Fabry-Perot interference |
| CN114235729A (en) * | 2021-12-17 | 2022-03-25 | 吉林大学 | Heavy metal ion detection device based on parallel Fabry-Perot interferometer |
-
2020
- 2020-03-17 CN CN202020328307.5U patent/CN211825683U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111208088A (en) * | 2020-03-17 | 2020-05-29 | 广东海洋大学 | Optical fiber heavy ion sensor based on Fabry-Perot interference |
| WO2021184675A1 (en) * | 2020-03-17 | 2021-09-23 | 广东海洋大学 | Fabry-pérot interference-based optical fiber heavy metal ion sensor |
| CN111208088B (en) * | 2020-03-17 | 2024-08-06 | 广东海洋大学 | Optical fiber heavy metal ion sensor based on Fabry-Perot interference |
| CN114235729A (en) * | 2021-12-17 | 2022-03-25 | 吉林大学 | Heavy metal ion detection device based on parallel Fabry-Perot interferometer |
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Granted publication date: 20201030 Effective date of abandoning: 20220823 |